8. The Carlota Music Company estimates that the marginal cost of manufacturing its guitar is C'(x)= 0.002x+100 dollars/month when the level of production is x guitars/month. The fixed costs incurred by Carlota are $4000/month. Find the total monthly cost incurred by Carlota in manufacturing x guitars/month. Calculate the total cost, the average cost, and the marginal cost of producing 9 guitars. Write a paragraph to management explaining the costs.